You took that statement completely out of context. Your comment show much more bias than the author. If you had read the article with any sense of objectivity, it would have been clear that the author actually makes a subtle case AGAINST Mac. He is merely stating an observation that many high profile open source developers have switched to Mac, which is true. There has a been a gradual shift to Mac from Linux in the modern generation of open source developers. Anyone who can't see that clearly isn't looking.
Also, while you are correct that many people move from Windows to Linux, it's fairly rare for someone to move from Mac to Linux, or Mac to Windows. Mac has tended to be a platform that people stick with. Again, if this isn't obvious then you haven't been paying attention.
Obviously we're never going to see RMS on a Macbook Pro, but that's the previous generation. The pioneering generation. The current generation isn't so ideological, and place more value on ease of use and aesthetics than the previous generation.
Also, while you are correct that many people move from Windows to Linux, it's fairly rare for someone to move from Mac to Linux, or Mac to Windows. Mac has tended to be a platform that people stick with. Again, if this isn't obvious then you haven't been paying attention.
Obviously we're never going to see RMS on a Macbook Pro, but that's the previous generation. The pioneering generation. The current generation isn't so ideological, and place more value on ease of use and aesthetics than the previous generation.